ASN Wikibase Occurrence # 160906
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| Date: | Tuesday 24 September 2013 |
| Time: | 09:20 |
| Type: |  Beech 35-B33 Debonair |
| Owner/operator: | Rex A Ott |
| Registration: | N8910M |
| MSN: | CD-690 |
| Year of manufacture: | 1963 |
| Total airframe hrs: | 6691 hours |
| Engine model: | Continental IO-470 N |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Five miles north of the city of Wabash, Indiana -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Washington, IA (AWG) |
| Van Wert, OH (VNW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that, while in cruise flight, he noticed a change in the engine sound and a 100-rpm increase on the tachometer. He adjusted the propeller control to lower the rpm, but the rpm immediately increased to over 3,500, which is above the red line. The pilot reduced the propeller and throttle controls, but the propeller continued to overspeed. The propeller then separated from the airplane, and engine oil covered the windscreen. The pilot subsequently made a forced landing to a soft bean field, which resulted in substantial damage to the fuselage, wings, and engine mounts. A postaccident examination of the engine revealed that the crankshaft was fractured forward of the No. 6 rod journal across the oil transfer collar area and that the No. 6 rod had separated from the crankshaft. An examination of the fracture revealed evidence of several overheating events at the surface of the crankshaft next to the oil transfer collar hole. A crack had formed adjacent to the overheated surface, and the surface crack led to a stress crack, which formed the surface of the main separation fracture.
Probable Cause: The failure of the crankshaft following several overheating events that had led to a stress crack and the subsequent fracture forward of the No. 6 rod journal.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Sep-2013 18:34 | gerard57 | Added |
| 24-Sep-2013 18:55 | Geno | Updated [Time, Aircraft type, Registration, Cn, Source, Narrative] |
| 24-Sep-2013 23:30 | Geno | Updated [Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 29-Nov-2017 09:14 | ASN Update Bot | Updated [Operator, Departure airport, Destination airport, Source, Narrative] |
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